\section{Class diagrams}

\begin{figure}[ht]
  \centering
  \includegraphics[height=15cm]{img/cd_parser.png}
  \caption{ray tracing parser}
\end{figure}

\begin{figure}[ht]
  \centering
  \includegraphics[height=10cm]{img/cd_wo.png}
  \caption{Ray tracing World Objects}
\end{figure}

\begin{figure}[ht]
  \centering
  \includegraphics[height=10cm]{img/cd_engine.png}
  \caption{Ray tracing Engine}
\end{figure}

